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Trimethoxyvinylsilane is an organosilane coupling agent and reactive silane monomer used to improve adhesion, moisture resistance, and interfacial bonding between inorganic surfaces and organic polymers.
Trimethoxyvinylsilane contains a vinyl-functional group for polymer reactivity and three methoxy groups that hydrolyze to silanols, allowing Trimethoxyvinylsilane to chemically bond to glass, silica, metal oxides, and mineral fillers.
Trimethoxyvinylsilane is widely used in polymer compounding, glass fiber sizing, adhesives, sealants, coatings, and crosslinkable wire and cable materials, but Trimethoxyvinylsilane must be handled carefully because Trimethoxyvinylsilane is flammable and reacts with moisture to release methanol.
CAS Number: 2768-02-7
EC Number: 220-449-8
Molecular Formula: C5H12O3Si
Molecular Weight: 148.23 g/mol
Synonyms: Trimethoxyvinylsilane, Vinyltrimethoxysilane, VTMS, VTMOS (common abbreviation), Vinyltrimethoxysilane Monomer, Vinyl Silane Coupling Agent, Silane A-171 (common trade reference), 2768-02-7 Vinyltrimethoxysilane, Trimethoxy(vinyl)silane, Vinyl Trialkoxysilane, Vinyl Silane Adhesion Promoter, Vinyltrimethoxysilane Crosslinking Silane, Trimethoxyvinylsilane, TRIMETHOXYVINYLSILANE, Trimethoxy vinyl silane, Vinyltrimethoxysilane, Vinyl trimethoxy silane, Vinyl Trimethoxy Silane, Vinyltrimethoxysilane (VTMS), VTMS, Vinyltrimethoxysilane (vinyl silane), Vinyl Silane (trimethoxy) (descriptive), Trimethoxy(vinyl)silane, Trimethoxy(vinyl) silane, Vinylsilane, trimethoxy- (registry-style), Silane, vinyltrimethoxy- (registry-style), Vinyltrimethoxysilane coupling agent, Vinyltrimethoxysilane silane coupling agent, Vinyltrimethoxysilane adhesion promoter, Vinyltrimethoxysilane crosslinker (use context), Vinyltrimethoxysilane grafting agent (use context), Vinyltrimethoxysilane surface treatment agent (use context), Vinyltrimethoxysilane primer (use context), Vinyltrimethoxysilane adhesion additive, Vinyltrimethoxysilane organosilane, Organosilane (VTMS), Vinyltrimethoxysilane (CAS 2768-02-7), CAS 2768-02-7, Vinyltrimethoxysilane (C5H12O3Si), C5H12O3Si, Trimethoxyvinylsilane (C5H12O3Si), Trimethoxyvinylsilane (EC 220-449-8) (common listing), EC 220-449-8, Vinyltrimethoxysilane (EINECS 220-449-8), Trimethoxyvinylsilane 98%, Vinyltrimethoxysilane 98%, Vinyltrimethoxysilane 99%, Trimethoxyvinylsilane 99%, Vinyltrimethoxysilane high purity, Trimethoxyvinylsilane high purity, Vinyltrimethoxysilane technical grade, Trimethoxyvinylsilane technical grade, Vinyltrimethoxysilane industrial grade, Trimethoxyvinylsilane industrial grade, Vinyltrimethoxysilane reagent, Vinyltrimethoxysilane for synthesis, Vinyltrimethoxysilane monomer (use context), Vinyltrimethoxysilane for polyethylene (use context), Vinyltrimethoxysilane for silane-crosslinked PE (use context), Vinyltrimethoxysilane XLPE silane (use context), Vinyltrimethoxysilane for cable compounds (use context), Vinyltrimethoxysilane for wire & cable (use context), Vinyltrimethoxysilane for composites (use context), Vinyltrimethoxysilane for glass fiber sizing (use context), Vinyltrimethoxysilane for mineral fillers (use context), Vinyltrimethoxysilane for silica (use context), Vinyltrimethoxysilane for alumina (use context)
APPLICATIONS
Trimethoxyvinylsilane is used as a coupling agent in filled polymers to improve filler dispersion and increase mechanical strength.
Trimethoxyvinylsilane is incorporated into silica-filled rubber to improve reinforcement and reduce hysteresis in compatible systems.
Trimethoxyvinylsilane is used in mineral-filled plastics to improve tensile strength and reduce moisture sensitivity.
Trimethoxyvinylsilane is used in glass fiber sizing to improve adhesion between glass fibers and polymer matrices.
Trimethoxyvinylsilane is incorporated into fiberglass-reinforced composites to improve interlaminar strength and durability.
Trimethoxyvinylsilane is used in glass mat and roving treatments to improve wet-out and final composite performance.
Trimethoxyvinylsilane is used in silane crosslinked polyethylene (Si-XLPE) cable insulation to enable moisture-cure crosslinking.
Trimethoxyvinylsilane is incorporated into wire and cable compounds to improve heat resistance and long-term mechanical stability.
Trimethoxyvinylsilane is used in hot water pipe compounds where moisture-cure crosslinking improves creep resistance.
Trimethoxyvinylsilane is used as a grafting silane in polyolefin systems to introduce silane functionality for crosslinking.
Trimethoxyvinylsilane is incorporated into reactive extrusion processes using peroxide initiators to graft vinyl silane onto polymer backbones.
Trimethoxyvinylsilane is used in moisture-curable polymer formulations to enable network formation after processing.
Trimethoxyvinylsilane is used in adhesives and sealants to improve adhesion to glass, ceramics, metals, and mineral substrates.
Trimethoxyvinylsilane is incorporated into MS polymer and hybrid sealant systems to improve wet adhesion and durability.
Trimethoxyvinylsilane is used in silicone and polyurethane systems as an adhesion promoter in compatible designs.
Trimethoxyvinylsilane is used in coatings to improve adhesion to mineral surfaces and increase water resistance.
Trimethoxyvinylsilane is incorporated into primers for metal and glass to improve bonding and reduce delamination.
Trimethoxyvinylsilane is used in protective coatings to improve resistance to moisture ingress at interfaces.
Trimethoxyvinylsilane is used in resin modification to improve compatibility of inorganic fillers and pigments with organic binders.
Trimethoxyvinylsilane is incorporated into pigment concentrates to improve dispersion stability and reduce settling.
Trimethoxyvinylsilane is used in masterbatches to improve processing and improve final surface appearance.
Trimethoxyvinylsilane is used in construction materials to improve bonding between cementitious substrates and polymer modifiers.
Trimethoxyvinylsilane is incorporated into mortar additives to improve water resistance and interfacial adhesion in compatible systems.
Trimethoxyvinylsilane is used in stone and concrete treatments as part of silane-based adhesion and durability strategies.
Trimethoxyvinylsilane is used in elastomer compounding to improve filler-polymer interaction and reduce moisture-related property loss.
Trimethoxyvinylsilane is incorporated into EPDM and specialty rubber systems to improve reinforcement in compatible formulations.
Trimethoxyvinylsilane is used in gasket and sealing compounds to improve durability on mineral-contact surfaces.
Trimethoxyvinylsilane is used in specialty chemical synthesis as a vinyl-functional silane intermediate.
Trimethoxyvinylsilane is incorporated into sol-gel formulations to introduce polymerizable vinyl groups into silica networks.
Trimethoxyvinylsilane is valued because Trimethoxyvinylsilane provides dual reactivity to connect inorganic surfaces with organic polymers and improve long-term adhesion and durability.
Trimethoxyvinylsilane is used as a silane coupling agent to improve adhesion between inorganic fillers and organic polymers.
Trimethoxyvinylsilane is used to enhance bonding in glass fiber reinforced plastics.
Trimethoxyvinylsilane helps increase mechanical strength by improving interfacial compatibility.
Trimethoxyvinylsilane is used in fiberglass sizing formulations to improve resin wet-out on glass surfaces.
Trimethoxyvinylsilane supports stronger composite laminates with improved durability.
Trimethoxyvinylsilane helps reduce moisture-driven loss of adhesion in reinforced materials.
Trimethoxyvinylsilane is used in polyolefin and EVA cable compounds as a crosslinking and coupling additive in silane-grafting systems.
Trimethoxyvinylsilane supports moisture-curable crosslinking routes for wire and cable insulation.
Trimethoxyvinylsilane helps improve heat resistance and mechanical integrity of cured cable jackets.
Trimethoxyvinylsilane is used in silane-crosslinked polyethylene (PEX) production as a grafting monomer.
Trimethoxyvinylsilane supports water-tree resistance and improved long-term cable performance.
Trimethoxyvinylsilane helps produce crosslinked networks under moisture-curing conditions.
Trimethoxyvinylsilane is used in rubber compounding to improve filler dispersion and rubber–filler interaction.
Trimethoxyvinylsilane supports improved tensile properties in silica- or mineral-filled elastomers.
Trimethoxyvinylsilane helps reduce filler flocculation and viscosity drift during processing.
Trimethoxyvinylsilane is used in tire and technical rubber formulations to improve reinforcement efficiency with certain fillers.
Trimethoxyvinylsilane supports improved dynamic performance by strengthening filler interfaces.
Trimethoxyvinylsilane helps improve abrasion resistance in selected elastomer systems.
Trimethoxyvinylsilane is used as an adhesion promoter in sealants and caulks for glass, ceramics, and metals.
Trimethoxyvinylsilane helps improve primerless adhesion in some silicone and hybrid sealant systems.
Trimethoxyvinylsilane supports stronger, more durable bonds under humidity exposure.
Trimethoxyvinylsilane is used in acrylic and polyurethane sealants to improve bonding to mineral substrates.
Trimethoxyvinylsilane supports adhesion to concrete, stone, and tile surfaces.
Trimethoxyvinylsilane helps reduce debonding and edge lift in demanding joints.
Trimethoxyvinylsilane is used in coatings as an adhesion promoter to improve bonding to glass and metal.
Trimethoxyvinylsilane helps improve wet adhesion and resistance to underfilm corrosion.
Trimethoxyvinylsilane supports better durability in outdoor and industrial coating systems.
Trimethoxyvinylsilane is used in waterborne coatings to improve adhesion to inorganic pigments and fillers.
Trimethoxyvinylsilane supports improved dispersion stability in some pigmented systems.
Trimethoxyvinylsilane helps maintain coating integrity under wet conditions.
Trimethoxyvinylsilane is used as a surface treatment for mineral fillers such as silica, quartz, and calcium carbonate.
Trimethoxyvinylsilane improves compatibility of treated fillers with hydrophobic polymer matrices.
Trimethoxyvinylsilane helps reduce water uptake and improve mechanical properties of filled plastics.
Trimethoxyvinylsilane is used to treat glass and ceramic powders used in polymer composites.
Trimethoxyvinylsilane supports higher filler loading while maintaining processability.
Trimethoxyvinylsilane helps reduce brittleness by improving stress transfer at interfaces.
Trimethoxyvinylsilane is used in adhesive formulations to improve bonding to glass, metals, and mineral surfaces.
Trimethoxyvinylsilane supports improved peel and shear strength in structural and semi-structural adhesives.
Trimethoxyvinylsilane helps maintain adhesion after thermal cycling and humidity exposure.
Trimethoxyvinylsilane is used in epoxy systems to improve adhesion and reduce interfacial failure.
Trimethoxyvinylsilane supports stronger bonds to concrete and glass in repair and anchoring applications.
Trimethoxyvinylsilane helps improve durability of bonded joints in wet environments.
Trimethoxyvinylsilane is used in construction chemical formulations such as primers for sealants and coatings.
Trimethoxyvinylsilane supports improved substrate wetting and chemical anchoring to mineral surfaces.
Trimethoxyvinylsilane helps improve long-term adhesion on porous building materials.
Trimethoxyvinylsilane is used in glass treatment and surface modification to introduce reactive silane functionality.
Trimethoxyvinylsilane supports improved bonding of subsequent organic coatings to glass.
Trimethoxyvinylsilane helps increase resistance to delamination in laminated structures.
DESCRIPTION
Trimethoxyvinylsilane is an organosilane with a vinyl functional group and three methoxy groups attached to silicon.
Trimethoxyvinylsilane is typically supplied as a clear, colorless liquid with a characteristic odor.
Trimethoxyvinylsilane is moisture-sensitive and can hydrolyze in the presence of water.
Trimethoxyvinylsilane hydrolyzes to form silanol groups that can bond to hydroxylated surfaces like glass and minerals.
Trimethoxyvinylsilane can then condense to form siloxane linkages, creating a durable interfacial layer.
Trimethoxyvinylsilane also provides a vinyl group that can participate in polymer reactions or grafting.
Trimethoxyvinylsilane is widely used as a coupling agent to improve adhesion between inorganic surfaces and organic resins.
Trimethoxyvinylsilane improves mechanical properties by strengthening the filler–matrix interface.
Trimethoxyvinylsilane can improve moisture resistance by reducing interfacial water sensitivity.
Trimethoxyvinylsilane is a colorless to pale liquid organosilane that hydrolyzes in the presence of moisture to form silanols, and these silanols can condense to form siloxane bonds to mineral surfaces.
Trimethoxyvinylsilane contains a vinyl group that can participate in free-radical reactions, allowing Trimethoxyvinylsilane to graft onto polymers or co-react within curable resin systems.
Trimethoxyvinylsilane is commonly used as a coupling agent because Trimethoxyvinylsilane creates an interphase that improves stress transfer, reduces interfacial water uptake, and improves mechanical integrity.
Trimethoxyvinylsilane hydrolysis releases methanol, so Trimethoxyvinylsilane handling and curing operations must manage ventilation and exposure controls.
Trimethoxyvinylsilane is sensitive to water and can self-condense during storage, so Trimethoxyvinylsilane should be kept tightly closed and protected from humidity.
Trimethoxyvinylsilane is flammable, and Trimethoxyvinylsilane vapor can form ignitable mixtures with air, so ignition sources must be controlled.
Trimethoxyvinylsilane should be stored in tightly closed containers in a cool, dry, well-ventilated place away from moisture and incompatible chemicals.
Trimethoxyvinylsilane should be handled with appropriate PPE to avoid skin and eye contact and to minimize inhalation of vapors.
Trimethoxyvinylsilane should be used according to supplier specifications and applicable regulations for the intended industrial application.
PROPERTIES
Chemical Formula: C5H12O3Si
Molecular Weight: 148.23 g/mol
Common Name: Trimethoxyvinylsilane (VTMS)
Chemical Type: Vinyl-functional trialkoxysilane coupling agent
Appearance: Colorless to pale yellow liquid
Odor: Mild characteristic odor
Solubility: Reacts with water; miscible with many organic solvents; limited solubility behavior depends on hydrolysis state
Boiling Point: ~123–125°C (typical)
Flash Point: ~20–30°C (typical; flammable)
Density: ~0.96–0.98 g/cm³ (typical)
Reactivity: Hydrolyzes with moisture to silanols and releases methanol; vinyl group can undergo radical polymerization
Moisture Sensitivity: High; moisture exposure can cause hydrolysis and condensation
Stability: Stable under dry storage; avoid moisture, acids, bases, and oxidizers that can accelerate reactions
Storage Temperature: 5–30°C, dry, tightly closed, well ventilated
Shelf Life: Typically 12–24 months in original sealed packaging (supplier dependent)
FIRST AID
Inhalation:
Move to fresh air if vapors are inhaled.
Seek medical attention if respiratory irritation, dizziness, or symptoms persist.
Keep the exposed person warm and at rest.
Skin Contact:
Wash with soap and water after contact.
Remove contaminated clothing and wash before reuse.
Seek medical advice if irritation develops or persists.
Eye Contact:
Rinse cautiously with water for several minutes.
Remove contact lenses if present and easy to do, then continue rinsing.
Seek medical attention if irritation persists.
Ingestion:
Rinse mouth with water and do not induce vomiting.
Seek medical attention promptly.
Never give anything by mouth to an unconscious person.
Note to Physicians:
Treat symptomatically.
Consider methanol exposure potential from hydrolysis in confined spaces.
Provide supportive care based on exposure route and symptoms.
HANDLING AND STORAGE
Handling:
Use appropriate PPE including chemical-resistant gloves and safety glasses or goggles.
Avoid breathing vapors and avoid skin and eye contact.
Keep away from heat, sparks, open flames, and hot surfaces, and use grounded equipment during transfer.
Ventilation:
Use local exhaust or general ventilation to control vapors.
Provide extra ventilation where hydrolysis could occur and release methanol.
Avoid confined spaces without adequate airflow.
Storage:
Store in tightly closed containers in a cool, dry, well-ventilated place.
Protect from moisture and humidity to prevent hydrolysis and pressure buildup in containers.
Keep away from oxidizers, strong acids, and strong bases.
Spill and Leak Procedures:
Eliminate ignition sources and contain the spill.
Absorb with inert material and collect into suitable containers for disposal according to local regulations.
Ventilate area well and clean residue to remove slip and flammability hazards.
Handling Precautions:
Use dry handling practices and keep containers closed to minimize hydrolysis and methanol release.
Confirm compatibility with catalysts, peroxides, and resin systems to avoid uncontrolled reactions.
Rotate stock using FIFO practices to maintain consistent reactivity and coupling performance.
